Type-writing machine.



A. G; P. KUROWSKI.

7 TYPE WRITING MACHINE. APPLICATION FILED AUG. 19, 1910.

Patented N0v.29,1910.

PATENT OFFICE,

ALFRED e. r. konowsxr, or New roan, N. Y., assreno'n "r UNDERWOQD TYPE-wn'rr en COMPANY, or NEW Yank, N. A. CORPORATION or DELAWARE.

TYPE-WRITING MACHINE;

Specification of Letters Patent. Patented NOV. 29, 1910.

To all whom it may camera:

i below the linoof writing, difficulty has been Be it known that I,ALFRo) G. F. KW nowsxi, a citizen of the United States, residing in theborough of Brooklyn, city of New York, in the county of Kings-and Stateof New York, have invented certain new and useful Improvements inType-VVriting Machines. of which the following is a specification.

This invention relates to line-spacing niechanismsfand especially todevices for advancing the'platen through part of a line space to enablethe printing of characters, or symbols, fete, below the usual writingline on the work sheet.

In printing thedenominators of fractions encountered, because of thenecessity of advancing the platenfby hand more thanhalf of a line spaceso that the types would print below the divisor-lines, and of holdingthe platen steady, against the tension of the usual spring detentQwhile'striking the keys.

The main object of this invention is to enable denominators or other.subscripts to be readily printed below the writing line.

This is done by mechanically advancing the platen through more than halfa line'space; and retaining it where adjusted; the usual spring detentbeing rendered ineffective to complete the rotation of the platenthrough.

an entire line space. A dog or tooth is forced into engagement with thespace wheel to advance the platen as required, and the usual springdetent is automatically cast off from the line-space wheel.

In the accompanying drawings, Figure 1 is a perspective, showing oneform of the in- -vention applied to an Underwood writing machine. Fig. 2is a side view, the device being idle. Fig. 3 shows the device in use. Aplaten 1 is fast on an axle 2, journaled in platen frame ends 3, and isline-spaced by a lever 4: through a slide 5 and pawl .6, the latterdriving a toothed wheel 7 fixed on the axle. A spring detent 8 engagesthe wheel 7. The usual releasinglever 9, (Fig. 1), loose on the axle, isrocked to cast off the-detent, when it is desired to'write on ruledlines, etc.

Type bars 10, carrying types 11' strike against the platen, certain ofsaid types preferably being made smaller than the ordinary lower casetypes, and arranged near the outer ends of the bars, as at 11, to formexponents or fraction numerat'o'rs, which strike the platen only whenthe latter is in upper case position to'print-above the usual writingline.

By swinging forwardly the handle 12 of a finger lever, pivoted at 13, aplate or broadened end 14, forming the opposite arm (Fig. 2) to itsactive position, (Fi 3) to enter a tooth 15, carried thereby, etween anytwo adjacent teeth of the wheel 7 and advance the platen part of aregular line types, shall strike belowthe usual line of writing (andsometimes directly beneath the exponents previously printed as in thecase of fractions).

A stop 16 on ter by striking one end edge of a slot 17 when the'platenhas been advanced more than half a line space,-'at which time the tooth15 may stand about in linewith the pivot 13 of the lever andthe axle 2,(see Fig.3).. H v

The platen remains in the Fig. 3 position during the operation of thetype keys, without the necessity of the operator retaining his hold onthe lever 12; since a spring 18 accidental displacement) is too weak torotate the platen. A 'pin 21 on the detent 8 normally rests in a recess22 in the broadened end 141. of the lever, one wall 23 of which recessforms a cam, which leads to a dwell portion 19 forming an are aboutconcentric with the pivot 13 and preferably constituting one wall of aslot 20. The lever on its initial stroke causes the cam 23 to dlsengagethe pin and detent from the wheel, the pin riding onto the dwell 19 tohold the detent disengaged, while the line space wheel is turned by thedog 15. By relieving the wheel of the pressure exerted by the detent,danger is avoided of the platen being turned through an entire linespace by the detent settling into thenext notch. The 51013 20 15 ofsutlicient width to accommodate the throw of the pin when cast off bythe usual detentreleasing lever 9. When the lever '12 is moved backtoward its idle position, to release the tooth 15 from the wheel, saidtooth starts the platen toward initial position.

Having thus described my invention, I claim:

1. In a typewriting machine, the combinaof the lever, is rocked from itsidle position (which normally holds the'lever 12 agains t' space so thatthe exponent types 11 or other the handle 12 arreststhe latthe lever.

wheel connected with the platen, and a detent engaging the Wheel, of atooth to turn the wheel and platen through part of a linespace, and avibratory finger lever controlling the tooth and having a recess toaccommodate a pin on the detent, onewall of the recess operating to castoff the detent von the initial stroke of the lever, and a dwell p01-tion to which the wall of the recess leads to hold the detentdisengaged. I

3. In a typewritingmachine, the combination of a platen, a notched ortoothed wheel connected with the platen, a detent to engage the wheel,said detent having a pin,

a finger lever having a tooth to turn the wheel through part of a line-sace, said lever having a cam recess, one w'al of which bears against thepin on the detent to cast oif the detent, a d ell portion forming oneedge ofthe slot and connected to the wall of the recess tohold thedetent disengaged, one end of said slot being enlarged to accommodatethe throw of the the releasing lever.

ALFRED \Vitnesses:

K. FRANKFOR'I, B. GOLDBERG.

pin when cast ofi' by G. F. KURowsKI.

